Doors, Bifold Doors and Sliding Doors: Styles, Materials, Costs and Installation

Doors, Bifold Doors and Sliding Doors

A practical guide to choosing external doors, bifold doors, sliding doors, French doors and patio doors, including styles, materials, costs, installation, security, thresholds, glazing and what to check before ordering.

Doors can completely change the way a home looks, feels and works. A new front door can improve kerb appeal and security. New patio doors can connect a kitchen, dining room or extension to the garden. Bifold doors can open up a whole wall. Sliding doors can create a cleaner modern view with fewer frame lines. French doors can give a traditional home a simple, elegant garden connection.

The best door choice depends on the property, the opening size, the budget, the design style, the amount of glass, the level threshold, ventilation, security, energy performance and how the door will be used every day.

This guide explains the main door types, materials, design choices, costs and installation issues homeowners should consider before placing an order.

Quick Answer

The main types of external doors used in home improvement projects are front doors, back doors, French doors, patio doors, bifold doors, sliding doors, stable doors and large glazed door systems.

Bifold doors are often chosen where homeowners want the widest possible opening to the garden. Sliding doors are often better where homeowners want larger panes of glass, slimmer sightlines and uninterrupted views. French doors are usually simpler, more traditional and often more cost-effective for smaller openings.

Common materials include uPVC, aluminium, timber, composite, steel-look systems and specialist heritage-style doors.

Before ordering doors, homeowners should check the opening size, frame material, glazing specification, threshold detail, drainage, security, ventilation, Building Regulations, planning restrictions, installation quality and whether structural work is needed.

What types of doors can homeowners choose?

There are many different door types, and the right answer is not always the most expensive or most fashionable option.

A door should suit the house, the opening, the way the room is used and the look the homeowner wants to achieve. A huge set of bifold doors may be ideal for one extension but completely unnecessary for another. A simple pair of French doors can sometimes look better in a period home than a very modern aluminium system. A sliding door may give a cleaner view than bifolds where the homeowner wants more glass and less frame.

Front doors

A front door is one of the most important visual features of a home. It affects first impressions, security, insulation and the character of the front elevation.

Common front door options include:

composite front doors;
timber front doors;
uPVC front doors;
aluminium front doors;
glazed front doors;
period-style panelled doors;
modern flush doors;
doors with side panels or fanlights.

A good front door should be secure, weather-resistant, well-fitted and appropriate for the style of the house. In a period property, the wrong door can damage the appearance of the whole frontage. In a modern home, a strong contemporary door can make the entrance feel cleaner and more confident.

Back doors and side doors

Back doors and side doors are often more practical than decorative, but they still need careful thought.

They may be used for garden access, side returns, utility rooms, bin routes, garage conversions, boot rooms, kitchens or everyday family use. These doors need to be durable, secure and suitable for frequent use.

A side or rear door may also need obscure glass, good locks, a practical threshold and a finish that can cope with weather and regular use.

French doors

French doors are a pair of hinged doors that open outwards or inwards. They are often used between living rooms, dining rooms, kitchens and gardens.

French doors can work well where the opening is not very wide or where the home has a more traditional style. They are usually simpler than bifold or sliding systems and can be a good solution for smaller rear openings.

French doors can suit:

period homes;
traditional extensions;
smaller garden openings;
dining rooms;
living rooms;
kitchen doors;
side or rear access points.

They do not provide the same wide opening as bifolds, but they can look balanced and elegant when the proportions are right.

Patio doors

The term patio doors is often used broadly to describe glazed doors leading to a garden or patio. It may refer to sliding doors, French doors or other glazed door systems.

Homeowners should be careful with the wording when comparing quotes. One company may use “patio doors” to mean a simple sliding system, while another may use the term more generally. The quote should clearly state the exact door type, material, size, glass and opening arrangement.

Bifold doors

Bifold doors are made up of several glazed panels that fold and slide to one or both sides of the opening.

They are popular in rear extensions and kitchen-dining spaces because they can open up a large part of the wall and create a strong connection between the house and garden.

Bifold doors are useful where the homeowner wants:

a wide opening;
indoor-outdoor entertaining space;
multiple folding panels;
flexible opening options;
a modern extension feel;
a strong garden connection.

However, bifolds are not always the best choice. When closed, they have more vertical frame lines than sliding doors. On very wide openings, the stacked panels can take up space. On smaller openings, the panel arrangement can sometimes feel awkward.

The design should be chosen around the width of the opening, the number of panels, the stacking direction, the traffic door, the threshold and the view when the doors are closed.

Sliding doors

Sliding doors use large glazed panels that slide past each other on tracks.

They are often chosen where homeowners want larger glass panels, slimmer sightlines and a more uninterrupted view to the garden. They can look excellent in modern rear extensions and contemporary refurbishments.

Sliding doors are useful where the homeowner wants:

larger panes of glass;
fewer vertical frame lines;
a cleaner view;
a modern appearance;
good garden connection;
less door stacking than bifolds.

The trade-off is that sliding doors do not usually open the whole wall unless a more complex pocket or multi-track system is used. At least one panel usually remains in place.

Sliding doors can be ideal where the view matters more than having the widest possible opening.

Lift-and-slide doors

Lift-and-slide doors are a higher-specification type of sliding door. The door lifts slightly when operated, making large glazed panels easier to slide, then lowers back down to seal when closed.

These systems are often used for larger, heavier and more premium sliding doors. They can be excellent, but they usually cost more than simpler sliding systems.

Pocket sliding doors

Pocket sliding doors slide into a hidden wall pocket or side cavity, allowing the opening to appear more open when the doors are pushed back.

These can look impressive but need to be designed early. The pocket needs space, structure, drainage, weathering and maintenance access. They are not something to add casually at the end of a project.

Stable doors

Stable doors are split horizontally so the top half can open while the bottom half remains closed.

They can suit cottages, period homes, boot rooms, utility areas and side entrances. They are useful where ventilation and partial opening are wanted without fully opening the door.

Steel-look and heritage-style doors

Steel-look doors and heritage-style glazed doors are often used where homeowners want a more characterful appearance.

They can work well in older properties, modern industrial-style interiors, rear extensions, garden rooms and internal screens. Some systems are aluminium designed to look like traditional steel, while others may be genuine steel or specialist heritage products.

These doors can look excellent, but the design should suit the property. Poorly proportioned bars or unsuitable frame thickness can make the result look fake or heavy.

TOP TIP

Choose the door type around how you will use the opening most of the year, not just how it looks on a sunny day. Bifolds can create a wider opening, but sliding doors often give a better view when closed, which is how the doors will look most of the time.

apn loft conversion design ideas_6119.jpg

apn loft conversion design ideas_3316.jpg

apn loft conversion design ideas_6114.jpg

apn loft conversion design ideas_3302.jpg

Which door material is best?

There is no single best material for every door. The right choice depends on the opening, budget, appearance, maintenance, security, performance and the style of the property.

uPVC doors

uPVC doors are often the most cost-effective option. They are common for back doors, side doors, basic patio doors and some front doors.

Advantages of uPVC can include:

lower cost;
low maintenance;
wide availability;
reasonable thermal performance;
practical use for everyday doors;
many colour and finish options.

Possible drawbacks include:

chunkier frames on cheaper products;
less refined appearance;
not always suitable for period homes;
lower-quality products can look tired over time.

uPVC can be perfectly acceptable for the right property and budget, but homeowners should avoid choosing a cheap door that spoils the appearance of the house.

Aluminium doors

Aluminium is popular for bifold doors, sliding doors, modern front doors and large glazed openings.

Advantages of aluminium can include:

slimmer frames;
strong profiles;
good for larger openings;
modern appearance;
durable powder-coated finishes;
wide colour range;
suitability for bifolds and sliders.

Possible drawbacks include:

usually more expensive than basic uPVC;
can look too modern for some traditional homes;
thermal performance depends on the quality of the system;
installation quality is critical.

Aluminium is often a strong choice for rear extensions, contemporary garden-facing rooms and larger glazed door systems.

Timber doors

Timber doors can look excellent, particularly in period homes and traditional properties.

Timber is often chosen for front doors, French doors, heritage properties, cottages and listed or conservation-sensitive homes.

Advantages of timber can include:

natural character;
traditional appearance;
repairability;
suitability for period homes;
ability to repaint or refinish;
strong visual quality.

Possible drawbacks include:

maintenance requirement;
higher cost for good-quality products;
risk of movement if poor-quality timber is used;
longer lead times for bespoke work.

A good timber door can transform a house. A poor timber door can warp, swell, stick or deteriorate if it is badly made, badly installed or poorly maintained.

Composite doors

Composite doors are commonly used for front doors. They usually combine different materials to create a strong, insulated and low-maintenance door.

They are popular because they can provide good security, thermal performance and a wide range of colours and styles.

Composite doors can be a good choice for:

front doors;
family homes;
modern replacement projects;
homeowners wanting low maintenance;
homes where security and insulation are important.

The quality and appearance vary, so homeowners should compare the actual product specification, not just the word “composite”.

Steel and steel-look doors

Genuine steel doors or steel-look systems can create a strong heritage or industrial appearance.

They are often used for internal screens, garden rooms, rear extensions and design-led glazing schemes. Some steel-look products are actually aluminium systems with narrow glazing bars designed to mimic the appearance of steel.

These systems can look very good, but they need careful proportioning. The spacing and thickness of the glazing bars should suit the opening and the property.

Glass specification

The glass is just as important as the frame.

Important glass options include:

toughened safety glass;
laminated safety glass;
double glazing;
triple glazing;
solar control glass;
low-emissivity glass;
acoustic glass;
obscure glass;
integral blinds;
low-iron glass;
privacy glass.

Large south-facing glazed doors may need solar control glass to reduce overheating. Doors near busy roads may need acoustic glass.

Bathrooms or side access doors may need obscure glass. Low thresholds and large glazed panels may need careful safety glass specification.

What design and installation issues matter most?

Doors are not just products. They are part of the building.

A good door installation must consider structure, thresholds, drainage, security, ventilation, weathering, floor levels, access and how the opening will work in real life.

Opening size and proportions

The width and height of the opening strongly affect the best door choice.

A narrow opening may suit French doors or a simple sliding door better than bifolds. A medium opening may work with either bifolds or sliders, depending on the desired look. A very wide opening may suit sliding doors if the homeowner wants large glass panels and minimal framing, or bifolds if the goal is to open as much wall as possible.

The number of panels matters. Too many narrow bifold panels can look busy. Very large sliding panels can look fantastic but may be heavy and expensive.

Bifolds versus sliding doors

This is one of the most common decisions in modern extensions.

Bifold doors are best where the homeowner wants a wide opening and the ability to fold the doors back.

Sliding doors are often best where the homeowner wants larger panes of glass, fewer frame lines and better views when the doors are closed.

A simple comparison:

choose bifolds for maximum opening;
choose sliding doors for cleaner views;
choose French doors for smaller, traditional openings;
choose lift-and-slide for larger premium sliding panels;
choose pocket sliders only where the structure and design allow.

The best choice depends on how the room will be used, not just what looks impressive in a photograph.

Thresholds and level access

Threshold design is very important, especially where doors connect a kitchen or living room to the garden.

Many homeowners want a flush or level threshold. This can look excellent and make the space feel connected to the patio or garden.

However, weathering, drainage and external levels must be designed properly.

If outside paving is too high, water can track back towards the house. If drainage is poor, heavy rain can cause problems. If the threshold is badly detailed, it may leak, feel draughty or fail over time.

A level threshold needs proper thought, not just a promise from a brochure.

Structural openings and steel beams

Large door openings often require structural work.

If a wall is being opened up for bifold doors, sliding doors or a wider glazed opening, a structural engineer may need to design a suitable beam or support arrangement. Building Control may also need to inspect the work.

The door supplier and builder need accurate structural opening dimensions before manufacturing. Ordering doors before the opening is properly agreed can create expensive problems.

Security

External doors should be considered carefully from a security point of view.

Important security features may include:

multi-point locking;
secure cylinders;
laminated glass;
internal glazing beads;
good hinges;
strong frames;
PAS 24-style security specification where applicable;
suitable locking for sliding doors;
security on easily accessible rear doors.

Front doors, side doors and rear garden doors are all common access points. Security should not be treated as a minor optional extra.

Ventilation

Modern doors and windows are more airtight than older ones. That can improve comfort, but ventilation still needs to be considered.

Where replacement doors include glazing or form part of a wider window and door replacement project, background ventilation may be relevant. Extensions, kitchens, utility rooms and open-plan spaces also need proper ventilation design.

This is especially important if old draughty doors and windows are being replaced with sealed modern products.

Building Regulations and certification

Replacement doors and new glazed doors may need Building Regulations compliance. This can involve thermal performance, safety glazing, ventilation, structure, security, fire escape and installation standards depending on the project.

Where replacement doors are fitted by a registered competent person scheme installer, the installer may be able to self-certify the work and provide the required certificate.

Where doors are part of an extension, structural alteration, garage conversion or larger building project, Building Control should usually be considered as part of the wider works.

Planning permission, listed buildings and conservation areas

Many ordinary replacement doors do not need planning permission if they are like-for-like and do not materially change the appearance of the house. However, this should not be assumed in every case.

Planning or listed building consent may be relevant where:

the property is listed;
the home is in a conservation area;
an Article 4 Direction removes normal permitted development rights;
the property is a flat or maisonette;
the door style or material is changing significantly;
a new opening is being formed;
the front elevation is being altered;
a garage door is being replaced with a window or wall;
a new extension is being built.

A front door change in a sensitive street can matter more than homeowners expect.

IMPORTANT POINT

Do not order bifold doors, sliding doors or large glazed doors until the structural opening, threshold detail, drainage, floor levels and Building Regulations route are clear. The door product may be excellent, but a poor opening or badly planned threshold can ruin the result.

How much do doors, bifolds and sliders cost?

Door costs vary widely depending on size, material, design, glass, hardware, security, colour, installation, access and whether structural work is involved.

A simple replacement back door will not cost the same as a large aluminium sliding door system in a rear extension. A standard front door will not cost the same as a bespoke timber entrance door with side panels and fanlight. A basic patio door will not cost the same as premium lift-and-slide glazing.

As a broad homeowner guide:

basic uPVC back doors are usually at the lower end of the cost range;
composite front doors usually cost more than basic uPVC doors;
timber front doors and bespoke period doors can cost significantly more;
French doors are often more cost-effective than large bifold or sliding systems;
aluminium bifold doors commonly cost several thousand pounds installed;
sliding doors can vary from modest patio doors to premium large-panel systems;
lift-and-slide and pocket sliding systems are usually higher-cost options;
large glazed openings may also need structural work, making good, drainage and threshold detailing.

For planning purposes, homeowners should allow not only for the door product but also for:

survey;
manufacturing;
delivery;
removal of existing doors;
installation;
making good;
plastering or decorating;
external trims;
drainage channels if needed;
structural steelwork if a wider opening is being created;
Building Control or certification;
VAT;
disposal of old frames;
access equipment or scaffolding where required.

The cheapest quote is not always the best value. A low-cost door may have weaker hardware, thicker frames, poorer thermal performance, limited colour choice, poor installation allowance or unclear certification.

How should homeowners compare door quotes?

Homeowners should compare the actual specification, not just the final price.

A useful quote should state:

door type;
frame material;
system/profile name where relevant;
overall width and height;
number of panels;
opening direction;
stacking direction for bifolds;
sliding track arrangement for sliders;
threshold type;
glass specification;
safety glass details;
colour inside and outside;
handle and hardware specification;
locking system;
trickle vents or ventilation approach if relevant;
security rating;
making good allowance;
lead time;
guarantee;
certification route;
whether VAT is included;
whether structural work is included or excluded.

If two quotes are not based on the same specification, they cannot be compared properly.

Doors, Bifolds and Sliders Planning Checklist

Before ordering external doors, bifolds or sliding doors, think about:

whether the door suits the style of the house;
whether the opening is better suited to French doors, bifolds or sliders;
whether the priority is maximum opening or maximum glass;
whether uPVC, aluminium, timber, composite or steel-look is most suitable;
whether the door is on the front, side or rear elevation;
whether the property is listed or in a conservation area;
whether planning permission or listed building consent may be needed;
whether Building Regulations approval or certification is required;
whether a competent person scheme installer will certify the work;
whether structural calculations are needed for a wider opening;
whether the threshold can be made level safely;
whether external drainage is needed;
whether the floor levels inside and outside work;
whether the door needs safety or laminated glass;
whether solar control glass is needed for sunny elevations;
whether acoustic glass is needed for noise;
whether the locking and security specification is good enough;
whether the quote includes making good;
whether the lead time works with the wider project;
whether the installer has experience with that door system.

Frequently Asked Questions About Doors, Bifolds and Sliding Doors

Are bifold doors better than sliding doors?

Bifold doors are better if the main aim is to open up as much of the wall as possible. Sliding doors are often better if the main aim is larger panes of glass, fewer frame lines and a cleaner view when the doors are closed.

Are sliding doors more modern than bifolds?

Sliding doors often give a cleaner, more modern appearance, especially with large glass panels and slim aluminium frames. However, bifolds can still look modern when well specified and properly installed.

Are French doors still a good option?

Yes. French doors can be a very good option for smaller openings, traditional homes and homeowners who want a simpler and often more cost-effective garden door.

Do bifold doors need planning permission?

Bifold doors may not need planning permission if they are installed in an existing opening or as part of permitted development work.

However, planning may be needed for new openings, extensions, flats, listed buildings, conservation areas or properties affected by Article 4 restrictions.

Do replacement doors need Building Regulations approval?

Replacement doors may need to comply with Building Regulations. A registered competent person scheme installer may be able to self-certify the work and provide a certificate.

Do I need a structural engineer for bifold or sliding doors?

A structural engineer may be needed if a wall is being opened up or widened to create a larger opening. Large glazed doors often require a beam or other structural support.

What is a level threshold?

A level threshold is where the internal floor and external patio or terrace are designed to meet with little or no step. It can look excellent but needs careful drainage, weathering and detailing.

Are aluminium doors better than uPVC doors?

Aluminium is usually better for slim frames, larger glazed openings and modern bifold or sliding systems. uPVC is usually more cost-effective and may be suitable for simpler doors and lower-budget projects.

Are timber doors worth it?

Timber doors can be worth it for period homes, front doors, conservation-sensitive properties and homeowners who want a traditional or high-quality appearance. They usually need more maintenance than uPVC or aluminium.

Can bifold doors leak?

Bifold doors should not leak if the system is suitable and installed properly. Problems often come from poor threshold design, bad drainage, incorrect installation, movement in the opening or low-quality products.

Which is cheaper: bifold doors or sliding doors?

It depends on the size, material and system. Basic sliding patio doors may be cheaper than bifolds, but premium large-panel sliding systems can be more expensive. Quotes should be compared on the same opening size and specification.

Can I have blinds inside bifold or sliding doors?

Yes, some systems can include integral blinds within the glazed unit or separate blinds fitted internally. Integral blinds can look neat but add cost and may affect repair options if they fail.

Should doors open inwards or outwards?

This depends on the door type, room layout, garden space, weather exposure and practical use. Many French and bifold doors open outwards to save internal space, while some front and side doors open inwards.

Can I replace a garage door with glazed doors?

Sometimes, but this may involve planning, Building Regulations, insulation, structure, floor build-up and external appearance issues. It should be considered as part of a garage conversion or wider alteration.

Planning New Doors, Bifolds or Sliding Doors?

APN Home helps homeowners understand the type of support they may need for home improvement projects, including replacement doors, bifold doors, sliding doors, French doors, extensions, garage conversions and wider refurbishments.

Whether you are replacing a tired front door, adding French doors to a dining room, choosing bifolds for a kitchen extension or comparing sliding doors for a new rear opening, it is worth getting the specification, opening and project route clear before placing an order.

Tell us about your project and APN Home can help you understand the next sensible step.

Tell Us About Your Project

Book a FREE Consultation